Apple Microarchitecture Research by Dougall Johnson

M1/A14 P-core (Firestorm): Overview | Base Instructions | SIMD and FP Instructions
M1/A14 E-core (Icestorm):  Overview | Base Instructions | SIMD and FP Instructions

FMULX (vector, 4H)

Test 1: uops

Code:

  fmulx v0.4h, v0.4h, v1.4h
  movi v0.16b, 1
  movi v1.16b, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 1.000

Integer unit issues: 0.000

Load/store unit issues: 0.000

SIMD/FP unit issues: 1.000

retire uop (01)cycle (02)031e3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map simd uop (7e)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst simd alu (9a)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10044037310613407251000100010005319084018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
10044037300613407251000100010005319084018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
10044037300613407251000100010005319084018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
10044037300613407251000100010005319084018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373006134072510001000100053190840184037403732583389510001000200040374037111001100001573116113473100040384038403840384038
10044037300613407251000100010005319084018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
10044037310613407251000100010005319084018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
10044037300613407251000100010005319084018403740373258338951000100020004037403711100110000073116113473100040384038403840384038
100440373006134072510001000100053190840184037403732583389510001000200040374037111001100001273116113473100040384038403840384038
10044037300613407251000100010005319084018403740373258338951000100020004037403711100110000073116113473100040384038403840384038

Test 2: Latency 1->2

Code:

  fmulx v0.4h, v0.4h, v1.4h
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e3a3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020440037300001000033939407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100000071011612394790100001004008740038400384003840038
10204400373000000002214394074510100100100001001000050057083041400184003740037381083387451010020010000200200004003740037111020110099100100100001000000710116123947914100001004003840038400384003840038
1020440037300000100010339407251010010010000100100005005706908140018400374003738108338745101002001016720020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
102044003730020000008239407251010010010000106100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100040071011611394790100001004003840038400384003840038
102044003730000000006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100003071011611394790100001004003840038400384003840038
102044003730000000006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
10204400373000000001104439407251010010010000100100005005706908140018400374003738108338745101252001000020020000400864003711102011009910010010000100000071011611394790100001004003840038400384003840038
102044003730000000006139407251010010010000100100005005706908040018400374003738108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
1020440037300000000025139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400374003711102011009910010010000100000071011611394790100001004003840038400384003840038
102044003730000000006139407251010010010000100100005005706908140018400374003738108338745101002001000020020000400844003711102011009910010010000100000071011611394790100001004003840038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)0318191e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100244003730000061394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010060640216323947310000104003840038401324003840038
100244003730000061394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
100244003730000082394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300005761394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
1002440037300000726394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069084001840037400373813033876710010201000020200004003740037111002110910101000010000640216223947410000104003840038400384003840038

Test 3: Latency 1->3

Code:

  fmulx v0.4h, v1.4h, v0.4h
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)030e1e1f3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696b6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb miss (a1)l1d cache writeback (a8)a9acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020440037300000613940725101001001000010010000500570690814001804003740037381153387451010020010000200200004003740037111020110099100100100001000000071011611395510100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690804001804003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570826614001804003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
10204400373000006139407251010010010000100100005005706908040018040037400373810833874510100200100002002000040037400371110201100991001001000010003900071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690804001804003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037299000613940725101001001000010010000500570690804001804003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690814001804003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690804001804003740037381163387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
10204400373000210613940725101001001000010010000500570690804001804003740037381083387451010020010000200200004003740037111020110099100100100001000000071011611394790100001004003840038400384003840038
1020440037300000613940725101001001000010010000500570690814001804003740037381083387451010020010000200200004003740037111020110099100100100001000100071011611394790100001004008540038400384003840038

1000 unrolls and 10 iterations

Result (median cycles for code): 4.0037

retire uop (01)cycle (02)03191e3a3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)simd prf full (72)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fst unit uop (a7)l1d cache writeback (a8)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002440037300000613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000360640216223947310000104003840038400384003840038
1002440037300000536394072510010101000010100005057069081400184003740037381300338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038
1002440037299000613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000270640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000240640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000240640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690804001840037400373813003387671001020100002020000400374003711100211091010100001000270640216223947310000104003840038400384003840038
100244003730000061394072510010101000010100005057069080400184003740037381300338767100102010000202000040037400371110021109101010000100000640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000210640216223947310000104003840038400384003840038
1002440037300000613940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000240640216223947310000104003840038400384003840038
10024400372990007263940725100101010000101000050570690814001840037400373813003387671001020100002020000400374003711100211091010100001000240640216223947310000104003840038400384003840038

Test 4: throughput

Count: 8

Code:

  fmulx v0.4h, v8.4h, v9.4h
  fmulx v1.4h, v8.4h, v9.4h
  fmulx v2.4h, v8.4h, v9.4h
  fmulx v3.4h, v8.4h, v9.4h
  fmulx v4.4h, v8.4h, v9.4h
  fmulx v5.4h, v8.4h, v9.4h
  fmulx v6.4h, v8.4h, v9.4h
  fmulx v7.4h, v8.4h, v9.4h
  movi v8.16b, 9
  movi v9.16b, 10

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2505

retire uop (01)cycle (02)03l2 tlb miss data (0b)1e3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696b6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042006015000422580100100800001008000050064000002002102004020040997339998801002008000020016000020040200401180201100991001008000010000051102161120037800001002004120041200412004120041
802042004015000422580100100800001008000050064000002002102004020040997339998801002008000020016000020040200401180201100991001008000010002051101161120037800001002004120041200412004120041
802042004015000422580100100800001008000050064000002002102004020040997339998801002008000020016000020040200401180201100991001008000010000051101511120037800001002004120041200412004120041
802042004015000422580100100800001008000050064000002002102004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
802042004015000422580100100800001008000050064000002002102004020040997339998801002008000020016000020040200401180201100991001008000010000051101161120037800001002004120041200412004120041
80204200401500042258010010080000100800005006400000200210200402004099733999880100200800002001600002004020040118020110099100100800001000172751101161120037800001002004120041200412004120041
8020420040150004225801001008000010080000500640000020021020040200409973399988010020080000200160000200402004011802011009910010080000100009651101161120037800001002004120041200412004120041
8020420040150004225801001008000010080000500640000020021020040200409973399988010020080000200160000200402004011802011009910010080000100006951101161120037800001002004120041200412004120041
8020420040150004225801001008000010080000500640000020021020040200409973399988010020080000200160000200402004011802011009910010080000100009051101161120037800001002004120041200412004120041
8020420040150004225801001008000010080000500640000020021020040200409973399988010020080000200160000200402004011802011009910010080000100007551101161120037800001002004120041200412004120041

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.2505

retire uop (01)cycle (02)03mmu table walk data (08)091e3a3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)6061696d6emap stall dispatch (70)simd prf full (72)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)accfd2l1i cache miss demand (d3)d5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200491500000412580010108000010800005064000000200212004020040999603100208001020800002016000020040200401180021109101080000100000502000316112003780000102004120041200412004120041
80024200401500000412580010108000010800005064000000200212004020040999603100208001020800002016000020040200401180021109101080000100000502000116112003780000102004120041200412004120041
800242004015000004125800101080000108000050640000002002120040200409996031002080010208000020160000200402004011800211091010800001000015502000216112003780000102004120041200412004120041
80024200401500000412580010108000010800005064083410200212004020040999603100208001020800002016000020040200401180021109101080000100003502000116112003780000102004120041200412004120041
800242004015000004125800101080000108000050640000002002120040200409996031002080010208000020160000200402004011800211091010800001000015502000216222003780000102004120041200412004120041
80024200401500000832580010108000010800005064000000200212004020040999603100208001020800002016000020040200401180021109101080000100000502000116112003780000102004120041200412004120041
80024200401500000412580010108000010800005064000000200212004020040999603100208001020800002016000020040200401180021109101080000100009502040116112003780000102004120041200412004120041
80024200401500000412580010108000010800005064000000200212004020040999603100208001020800002016000020040200401180021109101080000100000502000116112003780000102004120041200412004120041
800242004015000720412580010108000010800005064000000200212004020040999603100208001020800002016000020040200401180021109101080000100000502000216212003780000102004120041200412004120041
800242004015000006112580010108000010800005064000000200212004020040999603100208001020800002016000020040200401180021109101080000100000502000116112003780000102004120041200412004120041